Resolution of video can now be changed during call by passing it
frames with a different resolution.

Added function to change bitrate of video for later use.
Fixed out of bounds read.

payload_type seems to be completely useless and should be removed.
This seems to fix the crash that happens when changing the resolution
of the desktop stream to something higher than the initial one in utox.
Merge remote-tracking branch 'upstream/master'
Irrelevant debugging
Merge from origin